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Related Concept Videos

Fertilization01:38

Fertilization

During fertilization, an egg and sperm cell fuse to create a new diploid structure. In humans, the process occurs once the egg has been released from the ovary, and travels into the fallopian tubes. The process requires several key steps: 1) sperm present in the genital tract must locate the egg; 2) once there, sperm need to release enzymes to help them burrow through the protective zona pellucida of the egg; and 3) the membranes of a single sperm cell and egg must fuse, with the sperm...
Spermatogenesis01:41

Spermatogenesis

Spermatogenesis is the process by which haploid sperm cells are produced in the male testes. It starts with stem cells located close to the outer rim of seminiferous tubules. These spermatogonial stem cells divide asymmetrically to give rise to additional stem cells (meaning that these structures “self-renew”), as well as sperm progenitors, called spermatocytes. Importantly, this method of asymmetric mitotic division maintains a population of spermatogonial stem cells in the male reproductive...
Oogenesis02:07

Oogenesis

In human women, oogenesis produces one mature egg cell or ovum for every precursor cell that enters meiosis. This process differs in two unique ways from the equivalent procedure of spermatogenesis in males. First, meiotic divisions during oogenesis are asymmetric, meaning that a large oocyte (containing most of the cytoplasm) and minor polar body are produced as a result of meiosis I, and again following meiosis II. Since only oocytes will go on to form embryos if fertilized, this unequal...
What is Meiosis?01:34

What is Meiosis?

Meiosis is the process by which diploid cells divide to produce haploid daughter cells. In humans, each diploid cell contains 46 chromosomes, half from the mother and half from the father. Following meiosis, the resulting haploid eggs or sperm only contain 23 chromosomes; however, each of these chromosomes contains a unique combination of parental information that results from the meiotic process of crossing over.
Although meiosis shares similarities with mitosis—both rely on microtubules to...
What is Meiosis?01:36

What is Meiosis?

Meiosis is the process by which diploid cells divide to produce haploid daughter cells. In humans, each diploid cell contains 46 chromosomes, half from the mother and half from the father. Following meiosis, the resulting haploid eggs or sperm only contain 23 chromosomes; however, each of these chromosomes contains a unique combination of parental information that results from the meiotic process of crossing over.
Meiosis I01:49

Meiosis I

Meiosis is a carefully orchestrated set of cell divisions, the goal of which—in humans—is to produce haploid sperm or eggs, each containing half the number of chromosomes present in somatic cells elsewhere in the body. Meiosis I is the first such division, and involves several key steps, among them: condensation of replicated chromosomes in diploid cells; the pairing of homologous chromosomes and their exchange of information; and finally, the separation of homologous chromosomes by a...

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Related Experiment Video

Updated: Jul 5, 2026

Application of Mouse Parthenogenetic Haploid Embryonic Stem Cells as a Substitute of Sperm
08:08

Application of Mouse Parthenogenetic Haploid Embryonic Stem Cells as a Substitute of Sperm

Published on: November 19, 2020

Development of artificial gametes.

Zsolt Peter Nagy1, Irina Kerkis, Ching-Chien Chang

  • 1Reproductive Biology Associates, 1150 Lake Hearn Drive, Suite 600, Atlanta, GA 30342, USA. peter.nagy@rba-online.com

Reproductive Biomedicine Online
|April 17, 2008
PubMed
Summary
This summary is machine-generated.

Scientists explore creating artificial gametes to treat infertility. This involves techniques like somatic cell haploidization or reprogramming stem cells to produce germ cells for reproduction.

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Gamete Collection and In Vitro Fertilization of Astyanax mexicanus

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Area of Science:

  • Reproductive biology and cell biology.

Background:

  • Germ cells, essential for organism reproduction, are produced through meiosis, a process halving the chromosome number.
  • Meiosis involves two cell divisions without DNA replication, a conserved evolutionary mechanism.

Purpose of the Study:

  • To review strategies for generating artificial gametes in vitro.
  • To address infertility by creating a potential source of reproductive cells.

Main Methods:

  • Somatic cell haploidization: directly converting mitotic somatic cells to a meiotic state.
  • Stem cell-based approaches: dedifferentiating somatic cells into embryonic stem (ES) cells and then re-differentiating them into gametes.
  • Adult stem cell extraction and subsequent re-differentiation into gametes.

Main Results:

  • Multiple in vitro strategies exist for artificial gamete generation.
  • These methods aim to overcome infertility by producing functional germ cells.

Conclusions:

  • Artificial gamete generation holds promise for treating infertility.
  • Further research into these techniques could revolutionize reproductive medicine.